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Geological history of Kashmir. ... Read more

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This study represents a comprehensive and quantitative examination of the paleoecological evidence for forest community development in the Temperate Zone of Eastern North America since the last glacial maximum 20,000 years ago. A computerized fossil-pollen data set, compiled from 162 radiocarbon-dated paleoecological sites were used. Their fossil pollen spectra were transformed into an estimate of past dominance for 19 major tree taxa. Ecological ordination of the data allowed evaluation of the degree of persistence. Measurement of the rates of spread along major migration routes give new insights into the biogeography of temperate and boreal trees. These extensive studies are of interest to graduate students and researchers in all fields of ecology, as well as biogeography. ... Read more

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Section headings: Microstructure of Melt-Grown REBa2CU3O7-x Superconductors; Defects and Microstructural Engineering in Melt textured RE-123 Superconductors; Refinement of Y2BaCuO5 and Distribution of Microstructural Inhomogeneitities in Melt-Processed YBCO Superconductors; Real Domain Structure Originating in (110) Mechanic Twinning in YBa2Cu3O7-y; Microstructure and Superconducting Characteristics of HgxPbyBa2Ca2Cu3O8+s; Microstructure Studies in Ramp Type High Tc Josephson Junctions; Tranbsport in the Rare Earth-Nickel-Borocarbides (Rni2B2C); Superconductivity and Magnetism in Quarternary Borocarbides and Boronitrides. ... Read more

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Deals with the analysis of sediments, soils and weathering products to reconstruct the environment of the Quaternary period. Not only does it cover all physical and chemical laboratory techniques but it also describes the use of required equipment, the evaluation of both strengths and weaknesses of each technique and how to get and interpret results. The application of each method in solving particular geological problems is stressed. Case studies, diagrams and full biographies provide the reader with further information. ... Read more

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This book extends the dimensions of understanding the life history of Narmada and its tributaries, not only by discovering and reinterpreting various biological and cultural events, but also by seeking to uderstand varies aspects like river behaviour, flood history and manland relationship during the past. ... Read more

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Major new archaeological and historical study, many illus. scholarly, excellent production. India ... Read more

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This digital document is a journal article from Chemie der Erde - Geochemistry - Interdisciplinary Journal for Chemical, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

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Pedogenic needle-fiber calcite was studied regarding its morphology, texture and stable isotope composition from the paleosol of the Quaternary Varhegy travertine (Budapest, Hungary). The needle-fiber calcite is composed of 40-200@mm long monocrystals. Smooth rods as well as serrated-edged crystals with calcite overgrowths were identified by SEM. Needles have several textural varieties: randomly distributed crystals in vugs and pores with calcite hypocoatings, bundles of subparallel crystals forming coatings around grains and alveolar structure with bridging needles in vugs. The morphological study of needle-fiber calcite suggests that needles are calcified fungal sheaths and produced by fungal biomineralization, a common process in recent and fossil soils and calcretes. The stable isotope composition of needle-fiber calcite (average: @d^1^8O=-7.1%% and @d^1^3C=-7.3%% vs. V-PDB) indicates significant incorporation of organically derived CO"2 and probably biological influence on needle genesis. Dissolved host rock travertine and/or atmospheric CO"2 could also contribute some carbon to the acicular calcite. ... Read more

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This digital document is a journal article from Quaternary Science Reviews, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

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Palynological analysis of cave sediments, in particular the analysis of pollen from speleothems is not a widely adopted approach to palaeoenvironmental studies in the British Isles. This disregard of speleopalynology may be due to the lack of understanding of the cave pollen taphonomy, and uncertainty and suspicion as to what cave pollen spectra actually represent. However, a number of studies of pollen from caves have been carried out, particularly in Belgium, France and Spain which have demonstrated speleothem pollen spectra to be representative of contemporary vegetation above the cave, with pollen generally well preserved. Speleothems have the distinct advantage over other pollen sources that they can be dated by high precision TIMS U-Th dating, up to an order of magnitude further back in time than ^1^4C dating of organic sediments would allow. This potentially allows previously unconstrained Middle Pleistocene palynological records to be precisely and accurately dated, thus providing a geochronologically controlled terrestrial record of palaeoenvironmental change. This paper presents a timely review of speleothem palynology, aiming to eliminate biases and misconceptions and illustrate the enormous potential this unique source of palaeoenvironmental data holds, particularly in providing accurately dated pollen records from previously understudied environments and time periods. ... Read more